Journal article

Synthesis of Highly Luminescent and Photo-Stable, Graded Shell CdSe/CdxZn1-xS Nanoparticles by In Situ Alloying

Klaus Boldt, Nicholas Kirkwood, Gary A Beane, Paul Mulvaney

CHEMISTRY OF MATERIALS | AMER CHEMICAL SOC | Published : 2013

Abstract

We report a facile and robust synthesis of CdxZn1-xS graded shells on CdSe nanoparticles that are prepared by interface alloying between CdS and ZnS shells at elevated temperatures. Alloying provides systematic control over the electronic structure and enables switching between Type-I and quasi-Type-II configurations. Good control of particle shape, shell thickness, and composition is achieved by slowly adding zinc oleate and octane thiol via syringe pump to readily prepared CdSe/CdS particles. The resultant quantum dots exhibit PL quantum yields of up to 97% and superior robustness toward environmental influences and quenching agents. Alloying promotes a blue-shift of both the absorption an..

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University of Melbourne Researchers

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Funding Acknowledgements

K.B. acknowledges the support of the Alexander von Humboldt Foundation through a Feodor Lynen research fellowship. N.K. would like to thank the Melbourne Materials Institute for support through an MMI/CSIRO scholarship.